网站首页 文章专栏 map在python2和python3之间的兼容性
在python2中的代码使用了map重复使用lambda函数,又对输出用len()取出长度
# map function Y_train = to_onehot(map(lambda x: mods.index(lbl[x][0]), train_idx)) # use len() in child function def to_onehot(yy): yy1 = np.zeros([len(yy), max(yy)+1]) yy1[np.arange(len(yy)),yy] = 1 return yy1
报的错误为:
TypeError: object of type 'map' has no len()
在map外面再加一层list
Y_test = to_onehot(list(map(lambda x: mods.index(lbl[x][0]), test_idx)))
Reference: 1. TypeError: object of type 'map' has no len() Python3 https://stackoverflow.com/questions/41903852/typeerror-object-of-type-map-has-no-len-python3